mirror of
https://github.com/GnoConsortium/gno.git
synced 2024-11-18 19:09:31 +00:00
86 lines
1.4 KiB
NASM
86 lines
1.4 KiB
NASM
* $Id: null.asm,v 1.1 1998/02/02 08:18:00 taubert Exp $
|
|
************************************************************
|
|
*
|
|
* NULL device driver
|
|
*
|
|
************************************************************
|
|
|
|
case on
|
|
mcopy port.mac
|
|
copy ../gno/inc/tty.inc
|
|
|
|
NullHeader START
|
|
|
|
ds t_open
|
|
* For speed/simplicity we use a non-standard, non-documented line
|
|
* discipline for the .null device
|
|
dc i4'NullInit2'
|
|
dc i4'NullDeInit'
|
|
dc i4'NullIOCTL'
|
|
dc i4'NullRead'
|
|
dc i4'NullWrite'
|
|
dc i4'NullNoFunc'
|
|
dc i4'NullNoFunc'
|
|
dc i4'NullNoFunc'
|
|
dc i4'NullNoFunc'
|
|
dc i4'NullNoFunc'
|
|
dc i4'NullNoFunc'
|
|
dc i4'NullNoFunc'
|
|
dc i4'NullNoFunc'
|
|
ds t_signalIO-editInd
|
|
dc i4'NullNoFunc' ; t_signalIO
|
|
dc i2'$FFFF' ; t_select_proc
|
|
dc i4'NullSelect' ; t_select
|
|
dc i4'0' ; t_selwakeup jmp set during install
|
|
|
|
NullNoFunc anop
|
|
rtl
|
|
END
|
|
|
|
NullInit2 START
|
|
result equ 0
|
|
subroutine (2:devNum),2
|
|
stz result
|
|
return 2:result
|
|
END
|
|
|
|
NullDeInit START
|
|
subroutine (2:devNum),0
|
|
return
|
|
END
|
|
|
|
NullWrite START
|
|
count equ 0
|
|
retval equ 2
|
|
subroutine (2:reqCount,4:dataPtr,2:devNum),4
|
|
stz retval
|
|
lda reqCount
|
|
sta count
|
|
return 4:count
|
|
END
|
|
|
|
NullRead START
|
|
count equ 0
|
|
retval equ 2
|
|
subroutine (2:reqCount,4:dataPtr,2:devNum),4
|
|
stz count
|
|
lda #$4C
|
|
sta retval
|
|
return 4:count
|
|
END
|
|
|
|
NullIOCTL START
|
|
retval equ 0
|
|
subroutine (4:tioc,4:dataPtr,2:devNum),2
|
|
stz retval
|
|
return 2:retval
|
|
END
|
|
|
|
NullSelect START
|
|
res equ 0
|
|
subroutine (2:ttyn,2:which,2:pid),2
|
|
lda #1
|
|
sta res
|
|
return 2:res
|
|
END
|